java/java-impl/src/com/intellij/codeInsight/navigation/ClassImplementationsSearch.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.codeInsight.navigation;
  17
  18 import com.intellij.psi.PsiElement;
  19 import com.intellij.psi.PsiClass;
  20 import com.intellij.psi.search.searches.ClassInheritorsSearch;
  21 import com.intellij.psi.search.PsiElementProcessorAdapter;
  22 import com.intellij.psi.search.PsiElementProcessor;
  23 import com.intellij.util.QueryExecutor;
  24 import com.intellij.util.Processor;
  25
  26 import java.util.ArrayList;
  27
  28 public class ClassImplementationsSearch implements QueryExecutor<PsiElement, PsiElement> {
  29   public boolean execute(final PsiElement sourceElement, final Processor<PsiElement> consumer) {
  30     if (sourceElement instanceof PsiClass) {
  31       for (PsiElement implementation : getClassImplementations((PsiClass)sourceElement)) {
  32         if ( ! consumer.process(implementation) ) {
  33           return false;
  34         }
  35       }
  36     }
  37     return true;
  38   }
  39
  40   public static PsiClass[] getClassImplementations(final PsiClass psiClass) {
  41     final ArrayList<PsiClass> list = new ArrayList<PsiClass>();
  42
  43     ClassInheritorsSearch.search(psiClass, psiClass.getUseScope(), true).forEach(new PsiElementProcessorAdapter<PsiClass>(new PsiElementProcessor<PsiClass>() {
  44       public boolean execute(PsiClass element) {
  45         if (!element.isInterface()) {
  46           list.add(element);
  47         }
  48         return true;
  49       }
  50     }));
  51
  52     return list.toArray(new PsiClass[list.size()]);
  53   }
  54 }